Antiferromagnetic-vortex dynamics driven by spin-polarized current in small thin disks

Abstract

We investigate vortex configuration confined in antiferromagnetic thin disks. By virtue of sublattice mismatch at the disk borders, we propose a model that takes such a magnetostatic-like cost into account. The model predicts that onion-like configuration interpolates between curly and divergent vortex. Concerning its dynamics, it is shown that the vortex acquires oscillatory dynamics with well-defined amplitude and frequency that may be controlled on demand by an alternating spin-polarized current. These findings may be useful for the emerging field of antiferromagnetic topological spintronics, once vortex dynamics may be controlled by purely electronic means.